Welcome to the new version of the Patents Manual. Please note there are changes to the numbering and sequence of the chapters and pages in the manual. You are encouraged to take the time to explore and familiarise yourself with this new structure. Special Rules

Date Published

In a limited number of areas of classification, special classification rules are used and they override the general classification rules. Wherever special rules are used, they are clearly specified in notes at the places concerned, for example, C04B 38/00, C08L, G05D.

For example, Note 2(b) following the title of subclass C08L (“Compositions of macromolecular compounds”) specifies that, in this subclass, compositions are classified according to the macromolecular constituent or constituents present in the highest proportion; if all these constituents are present in equal proportions, the composition is classified according to each of these constituents.

Amended Reasons

Amended Reason Date Amended
Back to top